Sleep Onesie 3.5 TOG Dragonflies
The Sleep Onesie is a TOG-rated sleeping bag alternative, designed to be worn on its own during sleep or with a Layer/PJs underneath for warmth and comfort.
Size Guide
Sleep Onesie
Please use your child's weight and height to find the most appropriate and safe size for them.
| ergoPouch Size
(same as size) |
Pouch Length (cm) | Chest width (cm) | Child Height (cm) |
|---|---|---|---|
| 6-12M (0-1y) |
74cm | 27.5cm | 68-84cm |
| 12-24M (1-2y) |
84cm | 30.5cm | 76-92cm |
| 2-3Y | 88cm | 32cm | 92-100cm |
| 4-5Y | 98cm | 35cm | 108-115cm |
| 6-8Y | 110cm | 38cm | 120-130cm |
| 8-10Y | 120cm | 40cm | 130-140cm |
| 10-12Y | 130cm | 42cm | 140-150cm |
| ergoPouch Size
(same as size) |
Pouch Length (inch) | Chest width (inch) | Child Height (inch) |
|---|---|---|---|
| 6-12M (0-1y) |
29.1" | 10.8" | 26.8 - 33.1" |
| 12-24M (1-2y) |
33.1" | 12" | 29.9 - 36.2" |
| 2-3Y | 34.6" | 12.6" | 36.2 - 39.4" |
| 4-5Y | 38.6" | 13.8" | 42.5 - 45.3" |
| 6-8Y | 43.3" | 15" | 47.2 - 51.2" |
| 8-10Y | 47.2" | 15.7" | 51.2 - 55.1" |
| 10-12Y | 51.2" | 16.5" | 55.1 - 59.1" |
The Sleep Onesie should be fitted around the neck to avoid your child slipping through. 2.5 TOG and 3.5 TOG Sleep Onesies should not be used in a 5-point harness or car seat for safety reasons.
See full size guide for all products
- Free delivery on orders over $100*
- Estimated dispatch: 11 June 2026
- 30-day returns & exchanges
- Maria D.Verified BuyerReviewingSleep Onesie 2.5 TOG StarbeamRated 3 out of 5 stars2 weeks agoIt’s what I ordered
Happy enough with item.
But after getting to so called discount codes, I couldn’t use either of them…
Found the experience frustrating.
Maree
- Sumita C.Verified BuyerReviewingSleep Onesie 3.5 TOG SageI recommend this productRated 5 out of 5 stars3 weeks agoWow
Really love all of your products. The quality is really strong and its so warm. Such a life saver in winter. I’d buy one of everything if I could!
- Kimberly S. M.Verified BuyerReviewingSleep Onesie 3.5 TOG DaisiesI recommend this productRated 5 out of 5 stars3 weeks agoVery comfy and safe
This sleep onsie is the perfect option for little ones who constantly kick the covers off even on freezing cold nights and prefer to have their feet out. My little girl can move around in it easily before bed and it keeps her so warm, she has worn it with nothing underneath and worn it with pyjamas underneath and both are comfortable and not too tight or restricting.